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- Title
Studies of structural, dielectric and electrical characteristics of YBaCuFeO<sub>5</sub> ceramics.
- Authors
Sahoo, Rashmi Rekha; Choudhary, R. N. P.
- Abstract
In the present work, we have mainly carried out comprehensive studies of structural, microstructure, dielectric, electrical (impedance, modulus, conductivity, leakage current) characteristics of the Fe-modified Y2BaCuO5 of a chemical composition of YBaCuFeO5, fabricated by a. cost-effective ceramic fabrication technique. Room-temperature X-ray diffraction studies reveal that it crystallizes in tetragonal crystal system. SEM and EDAX of the sample provide the micro structural details of the ceramic sample with homogeneous grain and grain-boundary distribution. Dielectric and impedance characteristics have been studied over a frequency range of (1 kHz–1 MHz). Maxwell–Wagner polarization effect observed from the frequency response of polarization study is also evident from the grain and grain-boundary resistances obtained from Nyquist plot. Electric modulus studies and scaling behavior with details of the relaxation time of the sample has been discussed. Leakage current behavior has also been discussed and the type of mechanism responsible for conduction is indicated to be space-charge limited conduction mechanism. Owing to the increasing demand for miniaturization of electronic components and the versatility of applications; design and fabrication of new dielectric ceramics is of great interest to us. Major applications include sensors, actuators, transducers and capacitors. These applications require the dielectric ceramics to have high value of dielectric constant, low dielectric loss, high Tc value (in case of ferroelectric sample) etc. So far detailed analysis of electrical transport behavior, impedance characteristics, I–V (current–voltage) characteristics and leakage current behavior within a temperature range from 25 °C -400 °C for YBaCuFeO5 has not been carried out. High-K dielectric materials finds major applications in central processing units, dynamic random access memories, multilayered ceramic capacitors that are the building blocks of printed circuit boards. In such a scenario exploring the dielectric, impedance and electrical behavior of the synthesized ceramic sample YBaCuFeO5 at room and higher temperature can provide significant insights which can help broaden the amount of work carried out for this material. In our synthesized sample we have observed a dielectric constant of 395 at 50 kHz at room temperature and high value of 8514 is observed at a higher peak around 231 °C for the same frequency.
- Subjects
DIELECTRIC loss; SPACE charge; CERAMICS; DYNAMIC random access memory; TETRAGONAL crystal system; DIELECTRICS; DIELECTRIC materials; CENTRAL processing units
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 19, p15704
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-08473-6